Expansion shaft



April 30, 1929- J. F. sTAcHowsKl 1,-71902 EXPANSION SHAFT Filed March 16, 1927 IIIIIIIIII-IIIIIIIIIII I ll|llulu|llhh|ml|llmlimmwnlu I Null I. Il l Ill n u MN. www

v INVENTOR.

M ATTORNEYS.

Patented Apr. 30, 11929.

UNITED STATES PATENT oEFICE. f

JOSEPH r. srAcHowsxI, or APPLETON, WISCONSIN.

EXPANSION SHAFT.

Application led March 16, 1927. Serial No.`1i75,806.

was often damaged rendering unfit for use' sonic of the paper thereon.

lt is, therefore, the primary object of the present invention to provide an expansion shaft suitable for the above-mentioned uses l constructed so that a roll or core may be easily inserted thereon or removed therefrom without the use of a tool and without any damage to the roll.

further object of the invention is Vto provide a manually adjustable expansion shaft which will releasably and tightly en gage a core or roll inserted thereon.

A further object of the invention is to provide an expansion shaft in which the circumference of the clamping or-engaging portion may he readily varied to suit the work.

A further object of theinvention is to provide an expansion shaft which is ef very simple construction, is easily operated and adjusted, is inexpensive to manufacture, is strong and durable, and is well adapted for thc purpose described.

A. further object of the invention is to provide an expansion shaft with which any ma' line 3--3 of Fig. 2; and

Fig. 4 is a cross-.sectional view taken on line 4-4 of Fig. 2.

Referring now more particularly to the drawing it will appear that the numeral 6 indicates an elongated shaft adapted to be revolved bya machine of which it formsa part and the vinner end portion of said shaft 1s built up by means of a collar 7 to a correct diameter to fit the machine bearing. An externally threaded cylindrical member 8 is shrunk onto the shaft 6 outwardly of the collar 7 and between the inner end of said threaded member and the collar 7 another collar 9 is held tightl on the shaft to protect the lend portion o the threaded member. i

An adjusting member 10 formed with a i bore, the major portion of which is of a diameter vconsiderably larger than that of the threaded member 8 and shaft 6, surrounds said members and its bore at its inner end portion is reduced and threaded, as at 11, whereby said adjusting member has a screw Iengagement with the threaded member 8.

The outer end portion of the adjusting member is secured by means of screws, 12, the ends of which ride in a groove 12 to a cy# lindrical portion 13 of a cone member 14 which is longitudinally movably mounted on the shaft 6. The outer end portion of the cone member is tapered and polygonal in shape with flattened faces 15.

The intermediate portion of the shaft 6 has movably mounted thereon an elongated sleeve 16 and the inner end portion of said sleeve enters an annular recess formed therefor in the end portion of thejcone member 14 and abuts against a shoulder 17.

An outer cone member 18 is mounted on an outer portion of the shaft 6 and said cone member is formed with an inner annular re cess 19 into which the outer end portion of the sleeve 16 extends and engages the shoulder 20.

A stationary cone member 21 is also mount.

ed on the sleeve 16 between the cones 14 and 18 and suitably spaced from the cone 14, and said cone member 21 is secured to the shaft 6 by means of pins 22. The inner end portion of said cone member is tapered toward the tapered end portion of the cone member 14 and is formed with similar flattened faces 23. The cone members 18 and 21 are connected by means of a sleeve 24 mounted on reduced portions 25 and 26 of the cones 18 and 21 respectively and said sleeve is secured to the first-mentioned cone by means of a screw 27.

- It will be noted that the longitudinally movable sleeve 16 is provided with elongated slots 28 through which said pins 22 extend and the sleeve can, therefore, have a limited longitudinal movement with respect to the shaft 6 and pins 22.

An ex ansion member is further provided an said expansion member comprises lof the cones 14 and 21 and are adapted to ride upwardly thereon, being held by keys or ribs 31 which enter complementary keyways 32 in said segment faces. The segments 29 are norma ly and against the sleeve 16 by means of a air of annular coiled springs 33 positione in annular recesses 34 in the outer surfaces `of the segments.

In the operation of the improved expansion shaft, a core for a roll is slipped onto the shaft so as to overlie the expansion mem# ber. Then, to clamp it firmly 1n position on the shaft, the adjusting member 10 is screwed so as to advance it toward the outer end of the shaft. This movement will cause the tapered end of the cone 14 to wedge further under said segments and force the other ends of said segments upwardly on the faces 23 of the stationary cone 21, whereby said expansion member will be expanded against the tension of the springs 33 and the circumference of the same enlarged, as shown in dotted lines in Fig. 1. Of course, the degree of expansionV may be varied and when expanded the knurled faces of the segmentsI will firmly engage the roll or core and clamp it against slipping. The expansion member may be-returned to normal position to release the core or roll.

It is obvious that a shaft may be equipped with any number of the expansion devices and when that is the case the cone 18 in the drawing will provide the movable cone and spaced therefrom to the right will be another stationary cone and` an expansion member will be mounted between the tapered ends of said cones. When the adjusting member 10 is turned the cone 18 will be moved outwardly through contact with the held closely together simple and novel construction, and is well adapted for the purpose set forth.

What I claim as my invention is:

1. An expansion shaft, comprising an elongated revoluble inner shaft of circular form in cross section and uniform diameter throughout its length, an expansion member mounted on an intermediate portion thereof, said expansion member being formed of adjacent segments yieldingly held in juxtaposition and the end portions of each segment being wedge shaped, `the sum of the lengths of the two wedge shaped end portions of each segment being greater than the length of the intermediate portion, a stationary member formed with a tapered inner end portion engaging one set of said wedge shaped end portions of the segments, a member longitudinally movable on said shaft and having a tapered end portion engaging the other set of said wedge shaped end portions of said segments, and a member revolubly mounted on the shaft for moving said last-mentioned member.

2. -An expansion shaft, Comprising an elongated revoluble inner shaft, of circular form in cross section and uniform diameter throughout its lenvth, an externally threaded member mounted fast on said shaft, an elongated sleeve loosely mounted on an intermediate portion of said shaft, a stationary cone member mounted on the shaft and secured thereto, a longitudinally movable cone member on saidl shaft, said cone members being spaced from each other and having downwardly tapered end portions directed toward each other, an adjusting member threadably mounted on said externally threaded member and engaging said movable cone member, and an expansion' member formed of a plurality of juxtapositioned and yieldably connected segments, each segment having a. pair of wedge shaped .end portions and each set of said end portions engage the tapered end portion of an adjacent cono member, the segments being uniformly separated by a relative movement of the cone members toward each other, the sum of t-he lengths of the two wedge shaped ond portions of each segment being greater than the lengths of the intermediate portion.

In testimony whereof, I aiiix my signature.

JOSEPH F. STACHOWSKI.

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